Harold Bhatkoti's blog………..

PSTN—H323GW—CUCM—PHONESInbound call works perfectly
Outbound Call (phone to PSTN)

=> Production CUCM Cluster
=> Nothing changed in CUCM, everything seems to be correct -i.e. RP/GW/GK perfectly fine.
=>Any outbound call doesn’t seem to be appearing in H323 GW
=> Dial Analyser tool shows everything as expected. No doubt in CUCM config!
=> The following tools | Commands  became useless! WHY?

debug voip ccapi inout – useless
debug isdn q931/q921 – useless
No infrastructure related issue or Teleco issue.CUCM and GW are in the same subnet – i..e the same layer2 domain.
Dial analyser results revels everything is 100% correct.

debug voip ccapi inout spat out the following;
May 21 04:57:32.006: //19/46CBDD9B8007/CCAPI/cc_api_call_media_reset_ind:
Interface=0x0, Call Id=19
May 21 04:57:32.014: //19/46CBDD9B8007/CCAPI/cc_api_set_called_ccm_detected:
CallInfo(called ccm detected=TRUE ccmVersion 3)
May 21 04:57:32.014: //19/46CBDD9B8007/CCAPI/cc_api_call_notify:
Data Bitmask=0x1, Interface=0x473254D8, Call Id=19
May 21 04:57:32.014: //19/46CBDD9B8007/CCAPI/cc_api_get_ssCTreRoutingNotSupporte
d:
CallInfo(ssCTreRoutingNotSupported=FALSE)
May 21 04:57:32.014: //19/46CBDD9B8007/CCAPI/cc_api_get_ccm_detected:
CallInfo(ccm detected=TRUE)
May 21 04:57:32.014: //18/46CBDD9B8007/CCAPI/ccCallNotify:
Data Bitmask=0x1, Call Id=18
May 21 04:57:32.034: //19/46CBDD9B8007/CCAPI/cc_api_caps_ind:
Destination Interface=0x481D9D0C, Destination Call Id=18, Source Call Id=19,
Caps(Codec=0x1, Fax Rate=0x80, Vad=0x1,
Modem=0x2, Codec Bytes=160, Signal Type=2)
May 21 04:57:32.034: //19/46CBDD9B8007/CCAPI/cc_api_caps_ind:
Caps(Playout Mode=1, Playout Initial=60(ms), Playout Min=40(ms),
Playout Max=1000(ms), Fax Nom=300(ms))
May 21 04:57:32.034: //19/46CBDD9B8007/CCAPI/cc_api_caps_ack:
Destination Interface=0x481D9D0C, Destination Call Id=18, Source Call Id=19,
Caps(Codec=g711ulaw(0x1), Fax Rate=FAX_RATE_14400(0x80), Vad=OFF(0x1),
Modem=ON(0x2), Codec Bytes=160, Signal Type=2, Seq Num Start=4977)
May 21 04:57:32.034: //18/46CBDD9B8007/CCAPI/cc_api_caps_ack:
Destination Interface=0x473254D8, Destination Call Id=19, Source Call Id=18,
Caps(Codec=g711ulaw(0x1), Fax Rate=FAX_RATE_14400(0x80), Vad=OFF(0x1),
Modem=ON(0x2), Codec Bytes=160, Signal Type=2, Seq Num Start=4977)
May 21 04:57:32.034: //18/46CBDD9B8007/CCAPI/cc_api_voice_mode_event:
Call Id=18
May 21 04:57:32.034: //18/46CBDD9B8007/CCAPI/cc_a

Easier than you would ever think.
*Check H323 Voice GW configuration – most likely ISDN port is not associated with VOIP dialplan.

EXAMPLE:

Dial-peer voice 10 voip
  destination-pattern 0T
   port 0/0/0:15 or trunkgroup AT&T <—- This is missing